On Mon, Mar 15, 2021 at 9:29 PM Shakeel Butt [off-list ref] wrote:

On Mon, Mar 15, 2021 at 9:20 PM Arjun Roy [off-list ref] wrote:

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Apologies for the spam - looks like I forgot to rebase the first time
I sent this out.

Actually, on a related note, it's not 100% clear to me whether this
patch (which in its current form, applies to net-next) should instead
be based on the mm branch - but the most recent (clean) checkout of mm
fails to build for me so net-next for now.

It is due to "mm: page-writeback: simplify memcg handling in
test_clear_page_writeback()" patch in the mm tree. You would need to
reintroduce the lock_page_memcg() which returns the memcg and make
__unlock_page_memcg() non-static.

To clarify, Shakeel - the tag "tag: v5.12-rc2-mmots-2021-03-11-21-49"
fails to build on a clean checkout, without this patch, due to a
compilation failure in mm/shmem.c, for reference:
https://pastebin.com/raw/12eSGdGD
(and that's why I'm basing this patch off of net-next in this email).

-Arjun